An introduction to customizing and expanding Unreal Engine’s Audio Mixer through the interfaces in IAudioExtensionPlugins.h. Because the interfaces already exist, Unreal makes it easy to directly get started with signal processing code when doing tasks like customizing the spatialization functionality used in your project.
This is an intermediate-level tutorial, and assumes you already have some experience with creating a plugin within Unreal, coding in C++ in the Unreal Engine, the higher-level structure of Unreal’s audio engine, and in writing DSP code for audio.
https://dev.epicgames.com/community/learning/tutorials/wZwV/unreal-engine-expanding-unreal-audio-engine-through-plugins-via-existing-interfaces